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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4fbdac139062e6d1163fcb52d8b0de86aeacb448b6dbf6bcf8c97f67e485ad' 
  AND token = 'EcNxpVqz974ngpXOloiFHEi/bXLL2p8/aiEoEGyKkE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}